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[C++][CI] ccache not effective on MSVC builds #50388
Description
Describe the bug, including details regarding any error messages, version, and platform.
In several MSVC-based C++ builds, we can see that ccache marks most compilation calls as uncacheable.
This causes these builds to be much slower than desired and to consume more CI resources.
Cacheable calls: 7560 / 76069 ( 9.94%)
Hits: 7033 / 7560 (93.03%)
Direct: 7021 / 7033 (99.83%)
Preprocessed: 12 / 7033 ( 0.17%)
Misses: 527 / 7560 ( 6.97%)
Uncacheable calls: 68509 / 76069 (90.06%)
Called for linking: 5360 / 68509 ( 7.82%)
Called for preprocessing: 560 / 68509 ( 0.82%)
No input file: 80 / 68509 ( 0.12%)
Unsupported compiler option: 62449 / 68509 (91.15%)
Unsupported source language: 60 / 68509 ( 0.09%)
Component(s)
C++, Continuous Integration
Activity
GH-50388: [C++][CI] Make ccache effective MSVC-based builds (#50387)
pitrou commentedon Jul 6, 2026
Issue resolved by pull request 50387
#50387